---
title: String.prototype
slug: conflicting/Web/JavaScript/Reference/Global_Objects/String
tags:
  - JavaScript
  - Property
  - Prototype
  - String
translation_of: Web/JavaScript/Reference/Global_Objects/String
translation_of_original: Web/JavaScript/Reference/Global_Objects/String/prototype
original_slug: Web/JavaScript/Reference/Global_Objects/String/prototype
---
<div>{{JSRef("Global_Objects", "String")}}</div>

<h2 id="Summary" name="Summary">요약</h2>

<p><strong><code>String.prototype</code></strong> 프라퍼티는 {{jsxref("Global_Objects/String", "String")}} 프로토타입 오브젝트를 표현하고 있습니다.</p>

<div>{{js_property_attributes(0, 0, 0)}}</div>

<h2 id="Description" name="Description">설명</h2>

<p>모든 {{jsxref("Global_Objects/String", "String")}} 인스턴스들은 <code>String.prototype</code>를 상속합니다. <code>String</code> 프라퍼티 오브젝트를 변경하면, 그 변경은 모든 {{jsxref("Global_Objects/String", "String")}} 인스턴스들에 영향을 주게 됩니다.</p>

<h2 id="Properties" name="Properties">Properties</h2>

<dl>
 <dt><code>String.prototype.constructor</code></dt>
 <dd>오브젝트의 프로토타입을 생성하는 함수를 명세합니다.</dd>
 <dt>{{jsxref("String.prototype.length")}}</dt>
 <dd>문자열의 길이를 반영합니다.</dd>
 <dt><code><em>N</em></code></dt>
 <dd><em>N</em>번째 위치에 있는 문자에 접근하기 위해 사용합니다.  <em>N</em> 은 0과 {{jsxref("String.length", "length")}}보다 작은 값 사이에 있는 양의 정수입니다. 이 퍼라퍼티들은 읽기 전용(read-only) 속성을 가지고 있습니다. </dd>
</dl>

<h2 id="Methods" name="Methods">메서드</h2>

<h3 id="Methods_unrelated_to_HTML" name="Methods_unrelated_to_HTML">HTML과 관련이 없는 메서드</h3>

<dl>
 <dt>{{jsxref("String.prototype.charAt()")}}</dt>
 <dd>문자열 내 특정 위치(index)에 있는 문자를 반환합니다.</dd>
 <dt>{{jsxref("String.prototype.charCodeAt()")}}</dt>
 <dd>문자열 내 주어진 위치(index)에 있는 문자의 유니코드 값을 반환합니다.</dd>
 <dt>{{jsxref("String.prototype.codePointAt()")}} {{experimental_inline}}</dt>
 <dd>주어진 위치에 있는 UTF-16으로 인코딩된 코드 포인터값인 음수가 아닌 정수값을 반환합니다. </dd>
 <dt>{{jsxref("String.prototype.concat()")}}</dt>
 <dd>두 문자열의 문자를 합쳐서 새로운 문자열로 만든 다음, 그 새로운 문자열을 반환합니다. </dd>
 <dt>{{jsxref("String.prototype.includes()")}} {{experimental_inline}}</dt>
 <dd>문자열 내에 찾고자 하는 문자열이 있는지를 확인합니다. </dd>
 <dt>{{jsxref("String.prototype.endsWith()")}} {{experimental_inline}}</dt>
 <dd>문자열에서 특정 문자열로 끝나는지를 확인할 수 있습니다.</dd>
 <dt>{{jsxref("String.prototype.indexOf()")}}</dt>
 <dd>{{jsxref("Global_Objects/String", "String")}} 오브젝트에 있는 특정 값이 일치하는 첫 번째 인덱스 값을 반환하며, 일치하는 값이 없을 경우에는 -1을 반환합니다.</dd>
 <dt>{{jsxref("String.prototype.lastIndexOf()")}}</dt>
 <dd><a href="https://developer.mozilla.org/ko/docs/Web/JavaScript/Reference/Global_Objects/String" title="String 글로벌 오브젝트는 문자열의 생성자, 또는 문자열의 순서입니다."><code>String</code></a> 오브젝트에서 <code>fromIndex</code>로부터 반대방향으로 찾기 시작하여 특정 값이 일치하는 마지막 인덱스를 반환합니다. 문자열에서 일치하는 특정 값이 없으면 <code>-1</code>을 리턴합니다.</dd>
 <dt>{{jsxref("String.prototype.localeCompare()")}}</dt>
 <dd>Returns a number indicating whether a reference string comes before or after or is the same as the given string in sort order.</dd>
 <dt>{{jsxref("String.prototype.match()")}}</dt>
 <dd>Used to match a regular expression against a string.</dd>
 <dt>{{jsxref("String.prototype.normalize()")}} {{experimental_inline}}</dt>
 <dd>Returns the Unicode Normalization Form of the calling string value.</dd>
 <dt><s class="obsoleteElement">{{jsxref("String.prototype.quote()")}} {{obsolete_inline}}</s></dt>
 <dd><s class="obsoleteElement">Wraps the string in double quotes ("<code>"</code>").</s></dd>
 <dt>{{jsxref("String.prototype.repeat()")}} {{experimental_inline}}</dt>
 <dd>Returns a string consisting of the elements of the object repeated the given times.</dd>
 <dt>{{jsxref("String.prototype.replace()")}}</dt>
 <dd>Used to find a match between a regular expression and a string, and to replace the matched substring with a new substring.</dd>
 <dt>{{jsxref("String.prototype.search()")}}</dt>
 <dd>Executes the search for a match between a regular expression and a specified string.</dd>
 <dt>{{jsxref("String.prototype.slice()")}}</dt>
 <dd>Extracts a section of a string and returns a new string.</dd>
 <dt>{{jsxref("String.prototype.split()")}}</dt>
 <dd>Splits a {{jsxref("Global_Objects/String", "String")}} object into an array of strings by separating the string into substrings.</dd>
 <dt>{{jsxref("String.prototype.startsWith()")}} {{experimental_inline}}</dt>
 <dd>Determines whether a string begins with the characters of another string.</dd>
 <dt>{{jsxref("String.prototype.substr()")}}</dt>
 <dd>Returns the characters in a string beginning at the specified location through the specified number of characters.</dd>
 <dt>{{jsxref("String.prototype.substring()")}}</dt>
 <dd>Returns the characters in a string between two indexes into the string.</dd>
 <dt>{{jsxref("String.prototype.toLocaleLowerCase()")}}</dt>
 <dd>The characters within a string are converted to lower case while respecting the current locale. For most languages, this will return the same as {{jsxref("String.prototype.toLowerCase()", "toLowerCase()")}}.</dd>
 <dt>{{jsxref("String.prototype.toLocaleUpperCase()")}}</dt>
 <dd>The characters within a string are converted to upper case while respecting the current locale. For most languages, this will return the same as {{jsxref("String.prototype.toUpperCase()", "toUpperCase()")}}.</dd>
 <dt>{{jsxref("String.prototype.toLowerCase()")}}</dt>
 <dd>Returns the calling string value converted to lower case.</dd>
 <dt>{{jsxref("String.prototype.toSource()")}} {{non-standard_inline}}</dt>
 <dd>Returns an object literal representing the specified object; you can use this value to create a new object. Overrides the {{jsxref("Object.prototype.toSource()")}} method.</dd>
 <dt>{{jsxref("String.prototype.toString()")}}</dt>
 <dd>Returns a string representing the specified object. Overrides the {{jsxref("Object.prototype.toString()")}} method.</dd>
 <dt>{{jsxref("String.prototype.toUpperCase()")}}</dt>
 <dd>Returns the calling string value converted to uppercase.</dd>
 <dt>{{jsxref("String.prototype.trim()")}}</dt>
 <dd>Trims whitespace from the beginning and end of the string. Part of the ECMAScript 5 standard.</dd>
 <dt>{{jsxref("String.prototype.trimLeft()")}} {{non-standard_inline}}</dt>
 <dd>Trims whitespace from the left side of the string.</dd>
 <dt>{{jsxref("String.prototype.trimRight()")}} {{non-standard_inline}}</dt>
 <dd>Trims whitespace from the right side of the string.</dd>
 <dt>{{jsxref("String.prototype.valueOf()")}}</dt>
 <dd>Returns the primitive value of the specified object. Overrides the {{jsxref("Object.prototype.valueOf()")}} method.</dd>
 <dt>{{jsxref("String.prototype.@@iterator()", "String.prototype[@@iterator]()")}} {{experimental_inline}}</dt>
 <dd>Returns a new <code>Iterator</code> object that iterates over the code points of a String value, returning each code point as a String value.</dd>
</dl>

<h3 id="HTML_wrapper_methods" name="HTML_wrapper_methods">HTML wrapper methods</h3>

<p>These methods are of limited use, as they provide only a subset of the available HTML tags and attributes.</p>

<dl>
 <dt>{{jsxref("String.prototype.big()")}} {{deprecated_inline}}</dt>
 <dd>{{HTMLElement("big")}}</dd>
 <dt>{{jsxref("String.prototype.blink()")}} {{deprecated_inline}}</dt>
 <dd>{{HTMLElement("blink")}}</dd>
 <dt>{{jsxref("String.prototype.bold()")}} {{deprecated_inline}}</dt>
 <dd>{{HTMLElement("b")}}</dd>
 <dt>{{jsxref("String.prototype.fixed()")}} {{deprecated_inline}}</dt>
 <dd>{{HTMLElement("tt")}}</dd>
 <dt>{{jsxref("String.prototype.fontcolor()")}} {{deprecated_inline}}</dt>
 <dd>{{htmlattrxref("color", "font", "&lt;font color=\"color\"&gt;")}}</dd>
 <dt>{{jsxref("String.prototype.fontsize()")}} {{deprecated_inline}}</dt>
 <dd>{{htmlattrxref("size", "font", "&lt;font size=\"size\"&gt;")}}</dd>
 <dt>{{jsxref("String.prototype.italics()")}} {{deprecated_inline}}</dt>
 <dd>{{HTMLElement("i")}}</dd>
 <dt>{{jsxref("String.prototype.link()")}}</dt>
 <dd>{{htmlattrxref("href", "a", "&lt;a href=\"rul\"&gt;")}} (link to URL)</dd>
 <dt>{{jsxref("String.prototype.small()")}} {{deprecated_inline}}</dt>
 <dd>{{HTMLElement("small")}}</dd>
 <dt>{{jsxref("String.prototype.strike()")}} {{deprecated_inline}}</dt>
 <dd>{{HTMLElement("strike")}}</dd>
 <dt>{{jsxref("String.prototype.sub()")}} {{deprecated_inline}}</dt>
 <dd>{{HTMLElement("sub")}}</dd>
 <dt>{{jsxref("String.prototype.sup()")}} {{deprecated_inline}}</dt>
 <dd>{{HTMLElement("sup")}}</dd>
</dl>

<h2 id="Specifications">Specifications</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
  <tr>
   <td>ECMAScript 1st Edition.</td>
   <td>Standard</td>
   <td>Initial definition.</td>
  </tr>
  <tr>
   <td>{{SpecName('ES5.1', '#sec-15.5.3.1', 'String.prototype')}}</td>
   <td>{{Spec2('ES5.1')}}</td>
   <td></td>
  </tr>
  <tr>
   <td>{{SpecName('ES6', '#sec-string.prototype', 'String.prototype')}}</td>
   <td>{{Spec2('ES6')}}</td>
   <td></td>
  </tr>
 </tbody>
</table>

<h2 id="Browser_compatibility">Browser compatibility</h2>

<div>{{CompatibilityTable}}</div>

<div id="compat-desktop">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Chrome</th>
   <th>Firefox (Gecko)</th>
   <th>Internet Explorer</th>
   <th>Opera</th>
   <th>Safari</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<div id="compat-mobile">
<table class="compat-table">
 <tbody>
  <tr>
   <th>Feature</th>
   <th>Android</th>
   <th>Chrome for Android</th>
   <th>Firefox Mobile (Gecko)</th>
   <th>IE Mobile</th>
   <th>Opera Mobile</th>
   <th>Safari Mobile</th>
  </tr>
  <tr>
   <td>Basic support</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
   <td>{{CompatVersionUnknown}}</td>
  </tr>
 </tbody>
</table>
</div>

<h2 id="See_also" name="See_also">See also</h2>

<ul>
 <li>{{jsxref("Global_Objects/String", "String")}}</li>
 <li>{{jsxref("Function.prototype")}}</li>
</ul>